The people being sued by the content creators in that article all had a business set up around importation and resale. No one seems to be a Joe Everyman who just wanted to buy a cheaper textbook to get through the semester. As such the argument's already been pushed all the way to the endpoint - should companies be allowed to sell products at higher prices in wealthier markets, and more cheaply in poorer ones?

I think we already went over the extreme case here before: buying up Steam keys from Asia & Eastern Europe and reselling them in the US. Purely digital, so it's basically all profit, with no need to put anything on a boat. As I recall, the argument is basically that people in weaker economies have no fundamental right to affordable video games, whereas consumers do have the right to buy things and resell them wherever they want.

There was a Valve interview where they noted that games used to be sold in Russia at parity with Western countries and released months later, so of course everyone just pirated everything. Now apparently Valve has become the first Western distributor to make major inroads in Russia, selling at deep discounts on or near the same release date as the West, but it could just cannibalize publishers' primary sales markets. So it might be better for them to just go back to horrifically overpriced & months late, and let the Asians and Eastern Europeans pirate everything.